[kvm-commits] [PATCH] kvm: testsuite: add lmsw test

[Avi Kivity]

From: Avi Kivity <[EMAIL PROTECTED]>

Signed-off-by: Avi Kivity <[EMAIL PROTECTED]>

diff --git a/user/test/x86/emulator.c b/user/test/x86/emulator.c
index 26c9aaa..c605518 100644
--- a/user/test/x86/emulator.c
+++ b/user/test/x86/emulator.c
@@ -128,14 +128,20 @@ void test_push(void *mem)
        report("push mem", stack_top[-3] == 0x123456789abcdeful);
 }
 
+unsigned long read_cr0(void)
+{
+       unsigned long cr0;
+
+       asm volatile ("mov %%cr0, %0" : "=r"(cr0));
+       return cr0;
+}
+
 void test_smsw(void *mem)
 {
        unsigned short msw, msw_orig, *pmsw;
-       unsigned long cr0;
        int i, zero;
 
-       asm("mov %%cr0, %0" : "=r"(cr0));
-       msw_orig = cr0;
+       msw_orig = read_cr0();
 
        asm("smsw %0" : "=r"(msw));
        report("smsw (1)", msw == msw_orig);
@@ -150,6 +156,25 @@ void test_smsw(void *mem)
        report("smsw (2)", msw == pmsw[4] && zero);
 }
 
+void test_lmsw(void *mem)
+{
+       unsigned short msw, *pmsw;
+       unsigned long cr0;
+
+       cr0 = read_cr0();
+
+       msw = cr0 ^ 8;
+       asm("lmsw %0" : : "r"(msw));
+       printf("before %lx after %lx\n", cr0, read_cr0());
+       report("lmsw (1)", (cr0 ^ read_cr0()) == 8);
+
+       pmsw = mem;
+       *pmsw = cr0;
+       asm("lmsw %0" : : "m"(*pmsw));
+       printf("before %lx after %lx\n", cr0, read_cr0());
+       report("lmsw (2)", cr0 == read_cr0());
+}
+
 int main()
 {
        void *mem;
@@ -174,6 +199,7 @@ int main()
        test_cr8();
 
        test_smsw(mem);
+       test_lmsw(mem);
 
        printf("\nSUMMARY: %d tests, %d failures\n", tests, fails);
        return fails ? 1 : 0;

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